CVS log for src/sys/kern/kern_ras.c

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rasctl(2): Avoid arithmetic overflow.

Reported-by: syzbot+40b6085d020ae47a6997@syzkaller.appspotmail.com
https://syzkaller.appspot.com/bug?id=8fb9b5dee9b056e4f8ad3b937dc5be1296608c5f

rasctl(2): Avoid overflow in address range arithmetic.

Remove various contortions to suppress warnings.  Rely on
-Wno-type-limits instead.

Reported-by: syzbot+8b0f1ced3fce82031535@syzkaller.appspotmail.com
https://syzkaller.appspot.com/bug?id=e9055200701cffd653d5b13491d85c34e07f06a3

Mostly merge changes from HEAD upto 20200411

Remove charade dancing around now-dead RCU patent.

xc_barrier - convenience function to xc_broadcast() a nop.

Make the intent more clear and also avoid a bunch of (xcfunc_t)nullop
casts that gcc 8 -Wcast-function-type is not happy about.

update from HEAD

Sync with HEAD

Make the execution flow canonical instead of jumping back and forth, and
complete the userland check.

Ensure the restartable atomic sequence is in userland, for real.

Rebase to HEAD as of a few days ago.

sync with head.

for a reference, the tree before this commit was tagged
as yamt-pagecache-tag8.

this commit was splitted into small chunks to avoid
a limitation of cvs.  ("Protocol error: too many arguments")

sync with head

Push/Pop pragma magic to avoid gcc warning aber a less-than NULL comparision

sync with head

sync to -current.

Remove COMPAT_SA / KERN_SA.  Welcome to 6.99.3!
Approved by core@.

sync with head.

Sync with HEAD.

Sync with HEAD.

Merge wrstuden-revivesa into HEAD.

Sync with HEAD.

Sync w/ -current. 34 merge conflicts to follow.

sync with head.

Fix error in previous.

ras_purgeall: avoid taking p_auxlock.

sync with head

Sync with HEAD.

Use kmem_alloc/free.

sync with head.

sync with head.

Initial checkin of re-adding SA. Everything except kern_sa.c
compiles in GENERIC for i386. This is still a work-in-progress, but
this checkin covers most of the mechanical work (changing signalling
to be able to accomidate SA's process-wide signalling and re-adding
includes of sys/sa.h and savar.h). Subsequent changes will be much
more interesting.

Also, kern_sa.c has received partial cleanup. There's still more
to do, though.

Remove clause 3 and 4 from TNF licenses

Add MI code to support in-kernel preemption. Preemption is deferred by
one of the following:

- Holding kernel_lock (indicating that the code is not MT safe).
- Bracketing critical sections with kpreempt_disable/kpreempt_enable.
- Holding the interrupt priority level above IPL_NONE.

Statistics on kernel preemption are reported via event counters, and
where preemption is deferred for some reason, it's also reported via
lockstat. The LWP priority at which preemption is triggered is tuneable
via sysctl.

- Rename crit_enter/crit_exit to kpreempt_disable/kpreempt_enable.
  DragonflyBSD uses the crit names for something quite different.
- Add a kpreempt_disabled function for diagnostic assertions.
- Add inline versions of kpreempt_enable/kpreempt_disable for primitives.
- Make some more changes for preemption safety to the x86 pmap.

Sync with HEAD.

sync with head

sync with HEAD

Sync with HEAD

Actually copy the ras list onto the child process during fork() - hi ad.
Might fix the 'ras' part of kern/37650.
For some reason the itimers aren't inherited either.

Start detangling lock.h from intr.h. This is likely to cause short term
breakage, but the mess of dependencies has been regularly breaking the
build recently anyhow.

Sync with HEAD

Merge vmlocking2 to head.

- Push kernel_lock back into exit, wait and sysctl system calls, mainly
  for visibility.
- Serialize calls to brk() from within the same process.
- Mark more syscalls MPSAFE.

Sync with head.

Convert all the system call entry points from:
    int foo(struct lwp *l, void *v, register_t *retval)
to:
    int foo(struct lwp *l, const struct foo_args *uap, register_t *retval)
Fixup compat code to not write into 'uap' and (in some cases) to actually
pass a correctly formatted 'uap' structure with the right name to the
next routine.
A few 'compat' routines that just call standard ones have been deleted.
All the 'compat' code compiles (along with the kernels required to test
build it).
98% done by automated scripts.

Sync with HEAD

sync with HEAD

Sync with HEAD.

sync with head.

ras_sync: deal with spurious wakeup and add comments.

Fix debug builds.

Make ras_lookup() lockless.

sync with head.

Sync with HEAD.

Sync with HEAD.

Sync with HEAD.

Changes to make ktrace LKM friendly and reduce ifdef KTRACE. Proposed
on tech-kern.

Sync with head.

sync with head.

Sync with head.

Return EEXIST if attempting to install a RAS that is already installed.

Pass an ipl argument to pool_init/POOL_INIT to be used when initializing
the pool's lock.

Sync with HEAD.

Kill caddr_t; there will be some MI fallout, but it will be fixed shortly.

sync with head.

Merge newlock2 to head.

Remove support for SA. Ok core@.

sync with head.

sync with head.

Sync with head.

Fix locking botches.

remove some __unused from function parameters.

sync with head

Protect RAS datastructures with p_rasmutex

- sprinkle __unused on function decls.
- fix a couple of unused bugs
- no more -Wno-unused for i386

Add specificdata support to procs and lwps, each providing their own
wrappers around the speicificdata subroutines.  Also:
- Call the new lwpinit() function from main() after calling procinit().
- Move some pool initialization out of kern_proc.c and into files that
  are directly related to the pools in question (kern_lwp.c and kern_ras.c).
- Convert uipc_sem.c to proc_{get,set}specific(), and eliminate the p_ksems
  member from struct proc.

sync with head.

Sync with head.

sync with head.

Make it compile on archs without __HAVE_RAS.

Make a couple of functions static.

sync with -current

sync with head.  xen and whitespace.  xen part is not finished.

Sync with HEAD.

Hi Perry!

nuke trailing whitespace

Fix the sync with head I botched.

Sync with HEAD.

Sync with HEAD

Pull up revision 1.9 (requested by yamt in ticket #41):
ras_fork: don't do PR_WAITOK holding a spinlock.

Pull up revision 1.8 (requested by yamt in ticket #41):
ras_install: don't do pool_get(PR_WAITOK) while we're holding a spinlock.

ras_fork: don't do PR_WAITOK holding a spinlock.

ras_install: don't do pool_get(PR_WAITOK) while we're holding a spinlock.

Convert pool_get()'s from nowait to waitok.  We're allowed to block,
and this is more acceptable since the code assumes success.

gmcgarry ok

Remove p_nras from struct proc - use LIST_EMPTY(&p->p_raslist) instead.
Remove p_raslock and rename p_lwplock p_lock (one lock is enough).
Simplify window test when adding a ras and correct test on VM_MAXUSER_ADDRESS.
Avoid unpredictable branch in i386 locore.S
(pad fields left in struct proc to avoid kernel bump)

Declare ras_pool in <sys/ras.h> instead of an extern declaration in
the file where it's needed.

Merge the nathanw_sa branch.

Catch up to -current

Fix signed/unsigned comparison warnings.

Catch up to -current.

sync kqueue with -current; this includes merge of gehenna-devsw branch,
merge of i386 MP branch, and part of autoconf rototil work

Fix debug printf format.

Include SA headers to mollify syscallargs.h

LWPify.

Catch up to -current.

sync kqueue branch with HEAD

catch up with -current.

file kern_ras.c was added on branch nathanw_sa on 2002-09-17 21:22:08 +0000

file kern_ras.c was added on branch kqueue on 2002-09-06 08:47:54 +0000

file kern_ras.c was added on branch gehenna-devsw on 2002-08-29 05:23:08 +0000

MI kernel support for user-level Restartable Atomic Sequences (RAS).